Iceland moss

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ce·tra·ri·a

(sē-trā'rē-ă),
The dried plant, Cetraria islandica (family Parmeliaceae), a lichen, not a moss, used as a demulcent and as a folk remedy for bronchitis.
Synonym(s): Iceland moss
[L. caetra, a short Spanish shield (from shape of the apothecia)]

Iceland moss

n.
A brittle, grayish-brown lichen (Cetraria islandica) of Arctic and alpine regions, sometimes used as a food or in medicine.
A llichen that contains fumaric acids, iodine, and mucilage, which is antimicrobial and expectorant; it has been used for respiratory tract infections—e.g., tuberculosis—and as a bitter to stimulate and soothe the gastrointestinal tract